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Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

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Old 04-12-2019, 02:14 PM   #1
zfiles1701
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Whats needed to swap from B25 to B30 intake?

What do I need besides the DISA valve (just bought a B30 DISA) to swap my B25 intake manifold to a B30 intake manifold?
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Old 04-13-2019, 12:58 AM   #2
armenh7
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The throttle body is bigger which also means you need bigger intake boots and corresponding maf
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Old 04-13-2019, 01:18 AM   #3
donBogi
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Whats needed to swap from B25 to B30 intake?

You can use the b30 lower hose and the b30 upper plastic connector to upper hose. You can fit the b25 hose easily on that connector piece and keep the maf

So throttle body, lower hose and the plastic connector to the upper hose

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Last edited by donBogi; 04-13-2019 at 01:26 AM.
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Old 04-13-2019, 02:20 AM   #4
Aussigazza
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Intake temp sensor.
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Old 04-13-2019, 08:56 AM   #5
armenh7
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Originally Posted by donBogi View Post
You can use the b30 lower hose and the b30 upper plastic connector to upper hose. You can fit the b25 hose easily on that connector piece and keep the maf

So throttle body, lower hose and the plastic connector to the upper hose

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I mentioned the maf since a bigger maf reads more airflow
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Old 04-14-2019, 09:25 PM   #6
zfiles1701
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Really appreciate the input. Got the throttle body with gasket, lower hose and the plastic connector to the upper hose on the way.
Looking into intake air temp sensor but it looks like B25 B28 and B30 take the same sensor. Part numbers?
Again thanks for input if you thing of anything else like tips or tricks to it please share.
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Old 04-15-2019, 03:12 AM   #7
donBogi
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Originally Posted by armenh7 View Post
I mentioned the maf since a bigger maf reads more airflow


I understand! I also put in the bigger maf but from my log readings without another bigger cam it is not really necessary


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Old 04-15-2019, 04:03 AM   #8
Aussigazza
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Quote:
Originally Posted by zfiles1701 View Post
Really appreciate the input. Got the throttle body with gasket, lower hose and the plastic connector to the upper hose on the way.
Looking into intake air temp sensor but it looks like B25 B28 and B30 take the same sensor. Part numbers?
Again thanks for input if you thing of anything else like tips or tricks to it please share.
According to Realoem they use the same sensor. Pn 13621739510.
Also make sure the vacuum nipples that go near the firewall are sealed if not used.
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Old 04-15-2019, 08:08 AM   #9
zfiles1701
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Originally Posted by armenh7 View Post

I mentioned the maf since a bigger maf reads more airflow


I understand! I also put in the bigger maf but from my log readings without another bigger cam it is not really necessary

Actually, I'm putting in a B30 intake cam. From what you guys are saying, looks like the bigger B30 maf and upper intake boot would make a difference. Is that correct?
And, does that mean I'll need to change my intake air filter box too?
Thanks
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Old 04-15-2019, 08:10 AM   #10
zfiles1701
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And, with the B30 MAF will I need to tune my DME or will stock B25 run ok without a tune?
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Old 04-15-2019, 08:18 AM   #11
Aussigazza
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Quote:
Originally Posted by zfiles1701 View Post
Originally Posted by armenh7 View Post

I mentioned the maf since a bigger maf reads more airflow


I understand! I also put in the bigger maf but from my log readings without another bigger cam it is not really necessary

Actually, I'm putting in a B30 intake cam. From what you guys are saying, looks like the bigger B30 maf and upper intake boot would make a difference. Is that correct?
And, does that mean I'll need to change my intake air filter box too?
Thanks
I had a 2.8 intake manifold and ecu on a 3.0 motor. Changed everything to 3.0 and made a world of difference.
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Old 04-15-2019, 04:25 PM   #12
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Originally Posted by zfiles1701 View Post
And, with the B30 MAF will I need to tune my DME or will stock B25 run ok without a tune?


It’s mandatory to “tune” your dme, otherwise it’s going to run crazy lean


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Old 04-15-2019, 09:19 PM   #13
zfiles1701
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It’s mandatory to “tune” your dme, otherwise it’s going to run crazy lean
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OK is there a tune you'd recommend and would there be a link to this site or somewhere else?
I was thinking of just running the 2.5 maf and not tune at first and put the 3.0 maf in and tune later.
But from what I've read here I'm thinking I better go with the 3.0 maf and tune.
Never tuned before. Thanks
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Old 04-17-2019, 03:59 AM   #14
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Well for the b30 maf you just need to copy the sensor definition from an b30 file to yours.

For the intake manifold I have no maps recommendations. I kinda did mine by myself, but I also put in the b30 cam and b30 maf. Still figuring out the tune to be safe.

Do some reading about MS43 here, install tunerpro, get all the hardware you need and pull your file off the car. Then we can talk about what you could do


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Old 04-17-2019, 10:15 AM   #15
zfiles1701
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OK
I'm not doing this job till I get software ready. Doesn't sound easy, but I will give it a try. I was wondering if there was some sort of generic shark tune or something like that that I could just plug and play. Just to avoid having it run lean. Really appreciate the help.
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Old 04-17-2019, 10:22 AM   #16
zfiles1701
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On more thing, if I left the 2.5 MAF on, would I have that lean problem? I was thinking of getting the car done and running and then later upgrading to the 3.0 MAF and tune the DME. Thanks
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Old 04-17-2019, 11:32 PM   #17
donBogi
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Well you will have some little extra air at higher rpms so it will be a little leaner than before but you should be safe I guess


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Old 04-20-2019, 08:22 PM   #18
zfiles1701
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Sanity check needed here. I ordered B30 parts and got them. Have the intake, TB, and DISA in my garage.

1 The intake manifold has a tag on it from seller saying 2002 530X (sold as a 3.0). But, this looks just like the on my 2002 325i wagon. I even measured the top dimensions of both manifolds and see no difference.
2 DISA I bought as a 3.0 DISA looks jsut like my spare 2.5 DISA (My spare 2.5 DISA fits 530X manifold too)
3 Throttle body has this part number 1354 7 502 445-05, which I found on web for fitting B30 AND B25
4 New TB gasket part number 13547504729 for a B30 TB measures 79.5 mm outer diameter only
I'll working on getting some photos posted too. Input appreciated.
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Old 04-20-2019, 08:25 PM   #19
zfiles1701
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Add to 3. The throttle body actual ID is 70 mm and not 79.5 mm. Wondering if I was sent the right parts. Perplexed.
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Old 04-21-2019, 07:21 AM   #20
donBogi
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So, there should be a difference in every piece you have there for the conversion. The runners are shorter at the b30 manifold, while the “chamber” in front of them is much wider. The b30 Disa Unit has also a longer flap, so it can close the bigger chamber at the manifold. And the TB... should have an 3 inches diameter or so.

No parts should be compatible with the b25 intake


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